SU582885A1 - Method of making casting moulds and cores - Google Patents

Description

one

The invention relates to the field of foundry, mainly for sandblasting and sandblasting of molds and cores.

A known method of making molds and

rods, according to which the process of compaction of molds and rods on sandblasting machines is combined with the process of their curing. According to this method, the catalyst is supplied with oAHoepeNreHHO or

just before the end of the process of inflating a mold or rod JlJ.

The disadvantage of this method is that the partial curing of the mixture takes place before the mixture is compacted, i.e. In this case, the presence of partially hardened resin films on the sand grains drives the subsequent compaction of the mixture to loose packing, the presence of porosity in the mold, which inevitably leads to a burn on the castings and a sharp deterioration of quality i. surface.

The purpose of the invention increase the uniformity of the density of the mixture in

the casting mold is achieved by blowing the molding mixture with a catalyst after it is supplied to the casting mold and the mixture is consolidated.

In this case; it is possible to reduce the pressure of injection of the mixture into rod chic, or the shape chamber, and therefore reduce the density of the mixtures, which, in turn, will increase the filtration rate of the catalyst when it is blown through the mixture and intensifies its curing process. The final compaction of the mixture is carried out by subsequent pressing.

An example of the implementation of the method, for example on an automatic line without flask molding sandblasted-press seals

mixes.

Claims (1)

At the initial point in the molding block, the molding chamber is under the blower nozzle: The sleeve is filled with the mixture through the open side of the wheel, after which the gate is closed. Before the mixture is blown, the pressing plates approach each other and the models are simultaneously sprayed. After comprehending a given position, the pressing pacts, stopping vayugo, closed the space after entering the molding chamber. Drying the mixture from the cell and the chamber, 1, after which the mixture is blown, is pressed first with low and then high pressure. Producing a mixture of the catalyst before or individually with pressing. After the eye of the purging and pressing, the models are pulled in and the pressing plates are retracted. With a total production cycle of the mold in the order of 15 seconds, the mixture is purged for approximately 7 seconds to cure. During this time, the mixture acquires the initial strength necessary for carrying out the quality drawing of the models and for pushing the mold out of the chamber, equal to about 1O% or final. The remaining 9O% strength of the mixture is cured due to natural curing by blown-in mtalizat after its insertion into the form of the rods and transporting it before the metal is poured. Claims The method of making casting molds into rods, comprising feeding the mixture into the molding tool under compressed air pressure and blowing it out with a catalyst, characterized in that, in order to improve the uniformity of the density distribution of the mixture in the mold, the mixture is blown with catalyst casting mold and further consolidating the mixture. Sources of information accepted in the examination at the examination: 1. German patent № 117О588, cl. 31 C 5/01, 1964.